I don't know, it depends on your snake & how fast she digests, which also depends on temperatures in her cage & your house (but don't over-heat a corn snake to make them digest faster)...best I can do is say "maybe or probably". Like all snakes, corn snakes thermo-regulate but some snakes prefer to hang out on the cool side more than others.
I assume the rigid schedule is for your convenience (?) since snakes sure don't need fed at exact intervals...it doesn't happen in nature. It doesn't take very long to feed a snake either, & personally, I'm pretty flexible & feed when my snakes are acting hungry, & I think you'll know too. (Shed cycles tend to destroy the schedules too, lol.)